linux-kernel - Re: [PATCH][RFC] Sound, Xonar, CS43xx: Don't overrun static array

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Date:	Sat, 22 Jan 2011 14:55:08 +0100
From:	"Clemens Ladisch" <clemens@...isch.de>
To:	"Jesper Juhl" <jj@...osbits.net>, linux-kernel@...r.kernel.org
Cc:	alsa-devel@...a-project.org, "Takashi Iwai" <tiwai@...e.de>,
	"Jaroslav Kysela" <perex@...ex.cz>
Subject: Re: [PATCH][RFC] Sound, Xonar, CS43xx: Don't overrun static array

Jesper Juhl wrote:
> 'cs4398_regs' in 'struct xonar_cs43xx' is an array of 'u8' with a size of 
> 8. So, this code in sound/pci/oxygen/xonar_cs43xx.c::dump_d1_registers()
> 
>     		for (i = 2; i <= 8; ++i)
> 	  			snd_iprintf(buffer, " %02x", data->cs4398_regs[i]);
> 
> will overrun the array when 'i == 8'.
> 
> I guess that what's needed to fix it is the trivial patch below, but I 
> must admit that I have no idea about this code, so I may very well be 
> wrong. Additionally, I have no way to actually test this, so all I know is 
> that the below compiles. Someone who actually knows this code should take 
> a look before anything is comitted - consider the below (not much more 
> than) a bug report.
> 
> Signed-off-by: Jesper Juhl <jj@...osbits.net>

Acked-by: Clemens Ladisch <clemens@...isch.de>

> ---
>  xonar_cs43xx.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/sound/pci/oxygen/xonar_cs43xx.c
> b/sound/pci/oxygen/xonar_cs43xx.c
> index 9f72d42..2527191 100644
> --- a/sound/pci/oxygen/xonar_cs43xx.c
> +++ b/sound/pci/oxygen/xonar_cs43xx.c
> @@ -392,7 +392,7 @@ static void dump_d1_registers(struct oxygen *chip,
>  	unsigned int i;
>  
>  	snd_iprintf(buffer, "\nCS4398: 7?");
> -       for (i = 2; i <= 8; ++i)
> +       for (i = 2; i < 8; ++i)
>  		snd_iprintf(buffer, " %02x", data->cs4398_regs[i]);
>  	snd_iprintf(buffer, "\n");
>  	dump_cs4362a_registers(data, buffer);
--
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